I spent a few more hours working on the moped today.
I cleaned the carburetor again <i>extremely</i> thoroughly.
I wanted to pull the flywheel but I don't have the proper tool. Out of desperation I drilled and tapped M8X1.0 holes in the flywheel and used a harmonic balance puller to try and pull the wheel off. After tightening for a while the bolts I threaded into the flywheel pulled out (destroying the fresh threads I had put in).
I retapped the flywheel with larger bolts (M10X1.5 this time). I hit the crank shaft with Liquid Wrench. I tightened the puller as far as I could. I banged on the flywheel with a hammer, I took a blow torch to the flywheel's center in a hope that that would loosen it. I put a length of pipe over the handle of my socket wrench and I tightened the puller some more until, finally, <b>the puller's tempered steel threads broke!</b>
And in case someone is about to ask, yes, I removed the flywheel nut!
Although I would still like to remove the flywheel and snoop around inside the magneto, I'm going to have to assume that the flywheel did <i>not</i> accidentally move out of spec.
I cleaned the exhaust again with a blowtorch --it's clean.
I put everything back together and the engine started and slowly picked up speed until it was running full bore. I kept this up for about twenty-five seconds and then slowed the engine down by letting up on the throttle. As the engine got to its mid-range I opened the throttle again to no avail. The engine eventually sputtered and died. After that the engine ran exactly as it had yesterday --it want to run, it fires, but won't go on its own. It no longer seems to be fouling plugs as ferociously as it used to.
Tomorrow I will swap carburetors with my other Peugeot and see what happens.
Can anyone tell me how to:
1) Remove the frikkin' flywheel from a Peugeot; and
2) Suggest what else might be wrong with this evil machine.
Thank you, and sorry for such a long post!